HVAC return air run component, namely, return air run component made primarily of non-metal used to form end of return air run; metallized corrugated paper-based pre-formed board for forming end of return air run defined between I-joists

'air':3,8,23,39 'base':29 'board':33 'compon':5,10 'corrug':26 'defin':41 'end':20,36 'form':19,32,35 'hvac':1 'i-joist':43 'joist':45 'made':11 'metal':16,25 'name':6 'non':15 'non-met':14 'paper':28 'paper-bas':27 'pre':31 'pre-form':30 'primarili':12 'return':2,7,22,38 'run':4,9,24,40 'use':17

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